The 2009 Ford Escape gas tank pressure sensor can be found on the fuel sending unit that is situated inside the fuel tank at the rear of the vehicle. This sensor is there to quantify the tension inside the tank and permit over the top vapor to vent off when the tensions get excessively high to forestall any mishaps. The gas in Your gas tank radiates vapor and these can develop in the fuel tank and for that reason You have a tension sensor. This will send the vapor out through the charcoal canister at the rear of the gas tank so they don't develop excessively high and bring about any harm to the tank or the fuel framework.